Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc529155e62e2d07…

MALICIOUS

PDF

96.2 KB Created: 2021-07-26 17:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5b174266de2d9de2c2bc7059c12ba195 SHA-1: ebda270a6d59f682a27d64643ec92bc050818801 SHA-256: cc529155e62e2d0733f68fa919f9811d201f331eb867284fe5ba7f11040b8347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://unipsyclinic.com/userfiles/file/20210520164754.pdf In PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ae39c1b00---faforabukajibubivadoneva.pdfIn PDF document text
    • http://land89.com/ckupload/files/kidolojufa.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/tetixemukoziba.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/donixobobuxagekowafoja.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a272db3b853---vewoxuxefisotamukis.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/93848867544.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/41876002661.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/84658188806.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bead1651912---sosutiresevubi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160714cfd63779---8205953660.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d8ee37aba---pidebubo.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/rumexuke.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zugasukelufadomasozo.pdfIn PDF document text
    • https://panama4d.com/contents//files/sonofadevupesifabimos.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/66e97935c3edf6e0d08ce29c1d82b01f/7151293034.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/gerukipudulasuwur.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160949874696f6---jemunalapu.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/18801860833.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2hr539uf99a16lpmo22o8rhfj2/robuve.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/nikezowaxigo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e96a9a772d0---bewujamu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83e9c2bf1e---6421776089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+deal+with+an+emotionally+abusive+mumPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 17052 bytes
SHA-256: bac078697b7a908420a9061f306af872cb4c56a84bded3004e74d28fb189eb65
font_02_sfnt_off00015973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15973 10908 bytes
SHA-256: 88f76258df317906d40011626b84049ea6a104ffda29b36ccf1d641cec45bacd

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